Update documentation link for pdm, use recommended includes/excludes

[akaIDIOT]

Update deeplink to PDM's documentation surrounding including / excluding files. Documentation also slightly contradicts current ignored files, it recommends to include project-local configuration in pdm.toml (not .pdm.toml).

Reasons for making this change

After using this ignore-file, I noticed it mentioned .pdm.toml, while my local pdm created pdm.toml.
Looking up the difference, noticed that the included / excluded files didn't match the recommendations in the project's documentation.

Links to documentation supporting these rule changes

• Domain used for the configuration linked from the project's README;
• Name of configuration file for project-local configuration;
• Recommendations for working with version control;

Merge and Approval Steps

• Confirm that you've read the contribution guidelines and ensured your PR aligns
• Ensure CI is passing
• Get a review and Approval from one of the maintainers

[wirecat]

Thank you for contributing!